#linuxcnc | Logs for 2020-06-16

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[03:11:49] <veegee> Hmmm I have this plasma cutter: https://www.everlastwelders.ca
[03:12:07] <veegee> I wonder if it can be rewired internally for 3 phase. I don't want to run 6 gauge wire for 240V 50A
[03:12:41] <veegee> I have a spare 45kVA 600V-240V transformer I can put next to it, but I'd rather not do that
[03:13:35] <veegee> If it's an inverter, then should be as simple as switching out the input rectifier to a 3 phase full bridge rectifier and hopefully get away with 10 gauge wire
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[03:17:10] <veegee> In other news, after opening the circuit breaker panel, I found that the idiot previous tenants of my industrial unit ran 14 gauge wire into a 60A breaker...
[03:17:17] <pink_vampire> veegee: I don't know what to tell you, I'm lucky to even have 220V here
[03:17:32] <veegee> single phase?
[03:17:58] <pink_vampire> 2 110V split phase
[03:18:06] <veegee> I feel so bad for you
[03:18:13] <veegee> that's standard in every house in Canada
[03:18:28] <veegee> 240/120, a few more volts :D
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[03:19:07] <veegee> I don't understand. Is copper so cheap there that they like running thick wires all over the place?
[03:19:22] <veegee> If it were me, I'd 600V 3 phase all the things
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[03:20:31] <veegee> If they're running 110V "for safety", just go all the way and do 48VDC
[03:20:32] <pink_vampire> the outlet is 240V 50A
[03:20:40] <veegee> for your oven right?
[03:20:49] <pink_vampire> yes,
[03:20:56] <veegee> yeah that's literally /every/ house in Canada.
[03:21:20] <pink_vampire> that was my only option to connect the spindle
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[03:21:40] <veegee> I just really really really don't want to run #6 wire
[03:21:56] <veegee> It's like 4x the cost of #10 AC90
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[03:22:14] <veegee> I just bought 150m of 10/3 AC90
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[03:22:44] <veegee> I mean I'll parallel two lengths of it if I have to, but not sure if that's against electrical code
[03:22:55] <veegee> I'll just treat it as a temporary line I guess
[03:23:15] <pink_vampire> I did a box with brakes that connect to that oven outlet, and from that box I'm using normal #14 wires to the spindle. (only 7A)
[03:23:44] <veegee> Well you have a house, so different situation. What you're doing is fine
[03:24:33] <veegee> I have an industrial unit with 3 phase utility power. I don't want to unbalance the phases that much by putting a huge 80A plasma cutter that draws 50A at 240V on 2 of the legs of the 208Y120
[03:24:39] <pink_vampire> it is not my house, I'm renting, if it was my house I was running the cable from the electrical panel to the spindle
[03:24:59] <veegee> you have a full lathe setup in a rented residence?
[03:25:00] <veegee> brave
[03:25:17] <veegee> It is a lathe right?
[03:25:22] <pink_vampire> mill, lathe..
[03:25:39] <veegee> I'm good with a mill. But know nothing about lathes. I need a lathe 101
[03:25:46] <veegee> I've watched all the this old tony videos but still
[03:25:57] <veegee> Stuff like the tool posts and so on
[03:25:58] <pink_vampire> it is a cute lathe
[03:26:13] <veegee> Will you teach me the basics? :D
[03:26:21] <pink_vampire> maximat7 with the milling head, and I also have the G0704
[03:26:33] <pink_vampire> veegee: sure!
[03:26:49] <veegee> yay! <3
[03:27:11] <veegee> First have to get this wiring sorted out, then hook up my new Acer E lathe 1440V
[03:27:23] <veegee> then stare at it until I'm comfortable looking at it
[03:27:25] <pink_vampire> 1440V O_O
[03:27:33] <veegee> 14x40 yes
[03:27:42] <pink_vampire> 1440 Volt?
[03:27:49] <veegee> no no, 600V 3ø
[03:27:58] <veegee> 1440V is the model of the lathe
[03:28:11] <pink_vampire> I thought you need to take a wire right from the pole
[03:28:13] <veegee> it's 14" swing over bed, 40" between centers
[03:28:15] <pink_vampire> LOL
[03:28:25] <veegee> No it's standard 600V
[03:28:33] <pink_vampire> mine I'm not sure
[03:29:21] <pink_vampire> 7" X 18"? maybe?
[03:29:33] <veegee> https://www.homedepot.ca jesus christ look at the price of that roll
[03:29:50] <veegee> They better be able to cut some short lengths so I can put a junction box and connect it to there
[03:30:07] <pink_vampire> $1,752.00 / roll
[03:30:14] <pink_vampire> for 150M
[03:30:34] <veegee> I hope they have that on the spools there where they cut custom lengths
[03:30:42] <pink_vampire> but it limited to 600V
[03:30:45] <veegee> they don't offer that for all the types of wire
[03:30:55] <veegee> 600V is the standard in Canada
[03:31:05] <pink_vampire> you don't need to have some safety margin?
[03:31:14] <veegee> It does, that's 600V nominal
[03:31:19] <veegee> 600VAC normal
[03:31:34] <veegee> of course peak breakdown voltage of the insulation is on the order of kilovolts
[03:31:54] <veegee> those ratings are all nominal so you can match them up with your service and circuit and so on
[03:32:03] <pink_vampire> I'm using 600V for the 220V for the spindle
[03:32:26] <veegee> 600V is safely and legally used here for 600VAC mains
[03:32:37] <veegee> that's what it's intended for
[03:33:03] <veegee> which means it handles 600V•sqrt(2)V peak easily with a huge margin of course
[03:33:14] <pink_vampire> I think here in we use aluminum to run from the pole to the house
[03:33:14] <veegee> I can test it with an insulation tester later
[03:36:07] <veegee> you americanos so silly
[03:36:27] <pink_vampire> "Aluminum provides a better conductivity to weight ratio than copper, and therefore is also used for wiring power grids, including overhead power transmission lines and local power distribution lines, as well as for power wiring of some airplanes."
[03:36:36] <pink_vampire> veegee: ^
[03:40:48] <veegee> Oh the silly comment wasn't about aluminimum
[03:41:38] <pink_vampire> do you use wire nuts?
[04:03:55] <pink_vampire> veegee: ^
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[04:11:23] <Deejay> moin
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[05:45:20] <JT-Cave> morning
[05:45:29] <XXCoder> hey
[05:45:41] <XXCoder> finally went to work after week of missing work
[05:45:46] <XXCoder> it was "fun"
[05:45:58] <XXCoder> im still little bit dizzy but hardly level of last week lol
[05:48:51] <XXCoder> just glad I managed to get note from er lol
[05:49:00] <XXCoder> otherwise no work till july 13th ow
[05:49:37] <JT-Cave> wow
[05:50:04] <XXCoder> its been first time i was unable to work more than 2 days so I forgot to ask for note lol
[06:00:30] <JT-Cave> looks like it's going to be a hot weekend here in the low 90's
[06:00:51] <XXCoder> hottest of week is 71f here
[06:00:57] <XXCoder> near constant cloud
[06:01:11] <XXCoder> only little rain, spring is ending here
[06:01:34] <XXCoder> 20 years ago we would get clouds sometimes all over summer, and rain maybe 4 ot 5 times
[06:01:37] <XXCoder> nowdays nah
[06:18:48] <pink_vampire> hi XXCoder
[06:19:00] <XXCoder> yo
[06:19:45] <pink_vampire> happy to hear that you are got back to work
[06:20:52] <XXCoder> yeah
[06:21:10] <XXCoder> while I dont really love work, I really hate skipping work
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[06:38:01] <pink_vampire> I need to find a nice set of tool holders for my lathe with 10mm shank or smaller
[06:43:31] <pink_vampire> what do you think about this set? https://www.ebay.com
[06:45:26] <XXCoder> i dont know enough about lathes to answer unfortunately
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[06:53:14] <pink_vampire> hi HighInBC
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[07:10:54] <JT-Cave> looks like a decent set for the price... not Kennametal quality but the photo looks ok
[07:11:23] <pink_vampire> do you know about Kennametal set?
[07:11:37] <pink_vampire> JT-Cave: ^
[07:11:48] <JT-Cave> yea many of mine are Kennametal
[07:12:25] <JT-Cave> some Iscar, some Sandvik and I think a Seco for threading
[07:13:03] <pink_vampire> I want something with 10mm shank or smaller like 1/4"
[07:13:42] <JT-Cave> my turret uses 1/2" shank so I had to machine down some of the tools to fit
[07:15:14] <pink_vampire> I'm trying to find something like a general set as a starting point.
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[07:15:54] <pink_vampire> now I'm using HSS and I hate to grind them in the house,
[07:16:12] <XXCoder> due to air smell etc?
[07:16:26] <pink_vampire> this is way I want to move to inserts
[07:16:39] <XXCoder> you should builod air filter system, buy 2 house filters, put it in tringle pattern with fan as third side
[07:16:43] <pink_vampire> smell, dust, time, noise.
[07:16:47] <XXCoder> seal top and bottom, tape seal stuff
[07:16:56] <XXCoder> it becomes very effective air cleaner.
[07:17:34] <pink_vampire> that is a very good idea
[07:17:40] <XXCoder> as bonus you could even coat filters with fiber filter thats 2 inches thicker. filters very effectively without slowing air down very much at all.
[07:18:03] <XXCoder> think best airflow is suck air though filters to blow clean air
[07:18:10] <XXCoder> but could be wrong there.
[07:18:29] <pink_vampire> but it will not help with the time and the dust all over
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[07:18:41] <XXCoder> it gets rid of unhealthy fine dust
[07:18:42] <JT-Cave> I have a 20" box fan with a filter on the front in each building to filter the airborn dust out
[07:18:49] <XXCoder> large dust no but fine dust is worse.
[07:18:59] <XXCoder> should get rid of most of smell by those fine dust too
[07:19:15] <XXCoder> though not something I can definitely say, wwhat with no smell ability and all.
[07:19:26] <pink_vampire> I will try making something like that
[07:20:03] <pink_vampire> but to move to inserts will solve it for good
[07:20:32] <XXCoder> yeah. those also get rid of superfine cutting oil solution in air too,.
[07:20:36] <XXCoder> good for your lungs.
[07:20:46] <JT-Cave> that shars set would be an ok place to start
[07:20:48] <XXCoder> or coolant whatever
[07:20:58] <JT-Cave> I assume your lathe is pretty small?
[07:21:07] <pink_vampire> maximat7
[07:22:26] <pink_vampire> and for AA holders I can't go larger then 7mm shank thickness (so I'm thinking maybe to get 1/4" or something abit larger and mill it down)
[07:23:07] <JT-Cave> https://www.shoppok.com
[07:23:12] <JT-Cave> like that one?
[07:23:14] <pink_vampire> but what inserts are cost effective? what parting tool to get?
[07:23:27] <pink_vampire> yes!
[07:24:26] <JT-Cave> parting tools need a very rigid Y axis and spindle
[07:24:38] <JT-Cave> the inserts depend on the material your turning
[07:25:01] <pink_vampire> mostly aluminum, brass and sometime steel
[07:25:19] <pink_vampire> right now I'm using a hacksaw
[07:25:39] <JT-Cave> aluminum needs dead sharp inserts while steel needs the blunt ones
[07:26:24] <pink_vampire> there is a holder that can be use for sharp or blunt inserts?
[07:27:06] <JT-Cave> some styles you can find inserts for either some you can't
[07:27:25] <JT-Cave> http://toolinghouse.com
[07:27:32] <JT-Cave> for example
[07:27:54] <JT-Cave> http://toolinghouse.com
[07:29:18] <JT-Cave> for example CC inserts are the same and TC inserts are the same
[07:29:22] <pink_vampire> I see that those inserts are super common and super cheap https://www.ebay.com
[07:30:03] <XXCoder> lol basically free. ones at work is $10 each. not 10 a box. each insert lol
[07:30:08] <XXCoder> and its cheaper ones at work
[07:30:13] <JT-Cave> thoses look like they are for steel
[07:30:39] <Tom_L> morning
[07:30:53] <XXCoder> yo
[07:31:14] <JT-Cave> http://www.carbidedepot.com
[07:32:33] <pink_vampire> CC = 80 deg diamond + 7 deg rake, the TC is triangle + 7 deg rake
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[07:35:03] <pink_vampire> so it is cheap because the tolerance is M
[07:36:09] <pink_vampire> so if I want a holder for CCMT060204-HM what do I need to look for?
[07:36:45] <JT-Cave> the same shape and IC diameter
[07:36:55] <XXCoder> hmm larger tol on tooling means you need to be more carefyl if you replace tool in middle of job
[07:37:06] <XXCoder> other than that no real cons I think
[07:37:20] <pink_vampire> it is a manual lathe...
[07:38:56] <XXCoder> yeah
[07:39:02] <XXCoder> another reason it matters less
[07:39:04] <pink_vampire> I can't find the side here CCMT060204-HM http://www.carbidedepot.com
[07:40:03] <pink_vampire> the "0" after the CCMT is the size?
[07:41:51] <JT-Cave> that's a strange one maybe 06 is the size dunno
[07:42:04] <pink_vampire> ok I see how it work, I need to look by the letter C
[07:42:18] <pink_vampire> and then 06 = 6mm
[07:43:35] <pink_vampire> so the holder is CC 6mm?
[07:44:12] <JT-Cave> could be, but I'm not sure about it
[07:45:34] <pink_vampire> in the Shars set I see that some tools need "CARBIDE SHIM LT16R-3.0"
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[08:00:25] <JT-Cave> I've never used a shim on an insert
[08:01:35] <pink_vampire> it is go under the insert
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[09:28:46] <Loetmichel> *giggle* Any educated guess what i am designing there? -> http://www.cyrom.org
[09:31:53] <JavaBean> its a "rotational axis" for a cnc machine
[09:31:54] <pink_vampire> trash bin with iris?
[09:35:08] <Loetmichel> wrong. Next try. Hint: that base is 160mm in diameter and the whole thing will have 6 steppers when finished ;)
[09:36:13] <pink_vampire> hexpod?
[09:36:37] <Loetmichel> close but no cigar
[09:37:25] * JavaBean grumbles, decides not to cheat
[09:39:27] <Loetmichel> lets say if i print it in orange i can put "kuka" on it and everyone will belive it ;)
[10:02:03] <elmo40_> veegee: you are in Canada? Yes, we get screwed on electrical wire pricing...
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[11:13:15] <JT-Cave> an automated chicken egg sorter
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[11:41:05] <veegee> elmo40_ yes, Toronto
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[11:41:13] <veegee> it's not horrible
[11:41:38] <veegee> Actually I really love that we have 600V 3ø
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[12:54:17] <jymmmm> $68 2KW VFD free shipping... https://aliexpress.com
[12:56:25] <jymmmm> Hurry, BUY NOW, only 24,456,345,345 remaining
[12:57:12] <Loetmichel> wtf?
[12:57:38] <Loetmichel> is there even enough sand to make that many?
[12:57:39] <Loetmichel> :-)
[12:58:03] <jymmmm> IDK, maybeeeeeeeeee
[12:58:54] <jymmmm> Loetmichel: Welllll, I found a 16.8 15A PS, still looking for a CC/CV module
[13:08:40] <jymmmm> Loetmichel: Do you have any idea what the CV specs here are saying??? Standard Charge method 0.5C CC charge to 4.2V, 4.2V CV charge to 0.02C cut-off
[13:11:45] <jymmmm> Loetmichel: CC of 30A (0.5C) till voltage is at 4.20, then CV of 4.20V till draw is =< 1.2A (0.02C) ???????
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[13:18:23] <Loetmichel> jymmmm: charge with constant voltgage to 4.2V, current limited to 1/2 the capacitty of your cells /h. Charge finished when pack draws less than capacity*0.02 (/h)
[13:19:30] <Loetmichel> so yes. exactly what you said if your capacity is 60Ah
[13:19:41] <Loetmichel> pack capacity
[13:19:53] <jymmmm> Loetmichel: 60AH, yes
[13:19:54] <Loetmichel> 4.2V per cell of course
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[13:21:53] <jymmmm> Loetmichel: Ok so first stage is 4.2V just limit to 30A max draw, second stage is still 4.2V whatever curent it wants, and when it reaches 1.2A or less, it's "full" ?
[13:22:47] <Loetmichel> yes
[13:23:00] <jymmmm> ok cool, ty
[13:23:04] <Loetmichel> i wouldnt even bother with the constant current thing
[13:23:14] <Loetmichel> you PSU can only supply 15A
[13:24:26] <jymmmm> Well, that's by choice, I haven't bought anything yet, just found a mean well PS that cna offer 16.8V at 15A or 30A, etc.
[13:24:27] <Loetmichel> just put a 0.08 Ohms 50W resistor in series with your battery. and the PSU
[13:25:03] <jymmmm> a shunt?
[13:25:09] <Loetmichel> but check if your PSU can hold 4.2V per cell to 1% or better.
[13:25:33] <Loetmichel> current limiting resistor, so your PSU will not shut off
[13:25:38] <Loetmichel> for overcurrent
[13:25:50] <Loetmichel> empty battery is 3V
[13:26:06] <Loetmichel> so 1.2V drop, 15A: 0.08 Ohms
[13:26:53] <Loetmichel> and at 1.2A "shut off" current you have less than 0.1V drop
[13:26:54] <Loetmichel> fits.
[13:26:59] <Loetmichel> perfectly
[13:27:30] <Loetmichel> done is your CC/CV charger ;)
[13:27:48] <jymmmm> LRS-150-15 https://www.meanwell.com
[13:28:04] <jymmmm> +/- 1% regulation
[13:29:45] <Loetmichel> sounds well within bounds
[13:30:25] <Loetmichel> also the resitor will take care of protecting your battery if the regulation is a bit off
[13:30:36] <jymmmm> Technically this is 4S 16.8V if that matters
[13:30:55] <Loetmichel> it will drop an additional <0.1V at "shutoff current" so it will not charge to absolute max
[13:31:11] <jymmmm> That datasheet says the voltage is adjustable to 16.8V
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[13:38:10] <Loetmichel> yes, its usually adjustable even further than whats on the datasheet
[13:38:21] <Loetmichel> the 12V meanwells usually can do 15.5
[13:38:34] <Loetmichel> on the upper limit of the pot
[13:40:15] <Loetmichel> you can do the math for the current limiting resistor yourself: Resistance is Voltage drop (1.2V per cell) divided by current you want to limit to
[13:40:23] <Loetmichel> @ jymmmm
[13:42:22] <jymmmm> Loetmichel: Ok, I can't find 0.08ohm@50W, but found 0.15ohm@50W (two in parallel gives 0.075ohm 1%)
[13:42:25] <Loetmichel> so if you have a 4s: 4*1.2V and 10A(the 150W meanwell) then its 0.48 Ohms 50W (10A times 4,8V drop)
[13:42:42] <Loetmichel> yeah, i thought one cell
[13:42:53] <Loetmichel> for a 4s you need more resistance
[13:43:33] <Loetmichel> and less current ;)
[13:43:54] <Loetmichel> point is that an empty cell is 3V
[13:43:56] <jymmmm> so 0.5ohm
[13:44:04] <jymmmm> right.
[13:44:04] <Loetmichel> yes, that would work
[13:44:18] <Loetmichel> for a 10A supply on a 4s lithium battery
[13:44:34] <jymmmm> 50W enough though? 16.8@10A= 168W ??
[13:44:45] <Loetmichel> be aware taht that thing gets HOT at full current
[13:45:04] <Loetmichel> yeah, it only dissipates 4,8V times 10A though
[13:45:11] <Loetmichel> so 50W is (barely) enough
[13:45:23] <Loetmichel> the rest of the power is going into the battery
[13:45:33] <jymmmm> I don't mind 100W jsut to CYA
[13:46:05] <Loetmichel> if you buy two 50W 1 ohm that would be not AS hot as one 50W 0,5 ohm
[13:46:11] <Loetmichel> so go that route if you want
[13:46:19] <Loetmichel> and put them in parallel
[13:46:30] <Loetmichel> should be cheaper than one 100W
[13:46:45] <jymmmm> oh yeah, and easier to cool /disapate the heat too
[13:47:04] <jymmmm> (more surface area)
[13:47:07] <Loetmichel> yes
[13:47:29] <Loetmichel> you can also use some MIG wire to make a 0.5Ohms resistor
[13:48:14] <jymmmm> I actually have some 18ga to 40ga nichrome wire here too
[13:49:20] <jymmmm> but I'll probably just buy the darn things =)
[13:49:58] <Loetmichel> about 2m of 0.7mm mig wire (NO flux core) should get you there
[13:50:40] <Loetmichel> and should be able to dissipate a LOT more than 50W
[13:50:48] <Loetmichel> if you make an "air coil" of it
[13:51:09] <Loetmichel> but yes, a bought reistor is better
[13:51:42] * Loetmichel tends to "want to do it NOW" so i often resorted to those hacks with "things at hand" like mig wire
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[13:51:54] <jymmmm> 2x 1ohm @ 100W... https://www.amazon.com
[13:52:19] <Loetmichel> Thats a bit overdoing it
[13:52:32] <Loetmichel> but if you think thats neccessary: go for it
[13:52:34] <jymmmm> It's cheaper than the 50W with shipping
[13:52:52] <Loetmichel> hihi, ok then
[13:52:59] <Loetmichel> should keep it coler
[13:53:02] <Loetmichel> cooler
[13:53:54] <jymmmm> Hmmm 5% okey??? https://www.amazon.com
[13:55:28] <Loetmichel> doesnt maater much
[13:55:30] <Loetmichel> matter
[13:55:39] <Loetmichel> its just a current limiter
[13:56:00] <Loetmichel> those meanwells can churn out quite a bit more than they are rated at
[13:56:55] <jymmmm> Yeah, I just figured spend the extra for QUALITY since meanwell has a good reputation AND ca give 16.8V (such an odd voltage to find)
[13:57:27] <Loetmichel> be aware that those green resistors are only rated 100W when screwed to a pretty sizeable heatsink
[13:57:28] <Loetmichel> !
[13:58:10] <jymmmm> I was thinkng 1/2" thick (12mm)
[13:58:16] <jymmmm> heatsink
[13:58:31] <Loetmichel> thickness isnt a concern for heatsinks
[13:58:36] <Loetmichel> surface area is
[13:58:44] <jymmmm> I mean fin depth
[13:58:49] <Loetmichel> ah!
[13:59:19] <Loetmichel> ready made heatsinks usually have a kelvin per watt rating
[13:59:31] <jymmmm> I'll have to see what I have here (maybe an old CPU heatsink) else get one off ebay/ali
[13:59:35] <Loetmichel> you dont want the resistors to get hotter than lets say 120°C
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[14:00:11] <jymmmm> hey lawernce
[14:00:14] <Loetmichel> so if you have 20°C ambient and want to dissipate 50W you need a heatsink that can do 2k/W or better
[14:00:20] <Loetmichel> better= lower
[14:00:40] <jymmmm> Loetmichel: So no making tea when charging is what your saying?
[14:01:03] <Loetmichel> you can absolutely do that
[14:01:20] <Loetmichel> there should be a max temp rating for your resistors.
[14:01:26] <Loetmichel> only a small cup though
[14:02:59] <jymmmm> Ok, so fll reservoir with water, 1/8" copper tubing attached to resistor, place cup with tea bag at side of charger and wait?
[14:03:11] <Loetmichel> and i imagine you dont want to wait 22h to heat your cup of water to boiling point ;)
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[14:03:40] <Loetmichel> yeah, would work
[14:03:51] <Loetmichel> IF you have the patience to wait 22h
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[14:04:08] <jymmmm> Loetmichel: The goal is 5 to 6 hours till fully charged, maybe a cup once finished charging
[14:04:13] <Loetmichel> thats how long it takes to heat up 0.2 liter of water (one cup) to 100°C from 20°C
[14:04:32] <jymmmm> oh, heh
[14:04:35] <Loetmichel> on a 50W power source
[14:04:44] <jymmmm> BTU's FTW =)
[14:04:48] <Loetmichel> indeed
[14:05:19] <jymmmm> Hmmm, heat pipes??? lol
[14:05:33] <Loetmichel> more like joules in this case though
[14:06:01] <Loetmichel> one kg of water needs 49xx joules to get one °C warmer
[14:06:23] <Loetmichel> 1 jpole is equal to one watt second
[14:06:56] <Loetmichel> so if you have 50W and 0.2 liter water (one standard cup) you need 22HOURS to get it to temp
[14:07:15] <Loetmichel> if i didnt have an error in my math
[14:07:23] <jymmmm> Ok, maybe if I charge via solar =)
[14:07:48] <jymmmm> I only have a 15W foldable solar panel right now
[14:08:04] <Loetmichel> THATS why i hated electronics in school while still being my hobby... MATH! ;()
[14:08:26] <Loetmichel> loads of it ;)
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[14:25:29] <jymmmm> Loetmichel: haha, but that's physics, not ohms law =)
[14:28:41] <Loetmichel> same thing
[14:28:46] <Loetmichel> basically
[14:28:48] <rmu|w> Loetmichel: it is about 4.2kJ/(kg K)
[14:29:13] <Loetmichel> rmu|w: is it? ups. remembered wrong then
[14:29:25] <Loetmichel> i was vertain its 4.9 something
[14:29:35] <Loetmichel> certain
[14:29:48] <rmu|w> 4.184 at 20°, varies a little bit with temperature
[14:30:10] <Loetmichel> ah, 4190, not 4910 ;) found my error
[14:30:16] <Loetmichel> <- getting old and forgetful ;9
[14:30:45] <Loetmichel> that will still not shorten the 22 hours much
[14:30:45] <jymmmm> Loetmichel: What is your name?
[14:30:56] <Loetmichel> Michael, why?
[14:30:57] <jymmmm> This looks intersting... https://www.aliexpress.com
[14:31:11] <jymmmm> Loetmichel: Just seeing if you remembered your name is all =)
[14:31:18] <Loetmichel> ah, because forgetful. no, not THAT bad
[14:31:28] <jymmmm> Just chekcing =)
[14:32:05] <rmu|w> no, not much
[14:32:44] <jymmmm> Hmmm, it has CC setting
[14:32:51] * Loetmichel shudders... that machine translation on aliexpress... :-(
[14:33:43] <jymmmm> to DE or EN ?
[14:35:41] <jymmmm> If that boost module actually worked as intended, I could charge 12VDC@14A from the car too
[14:35:42] <Loetmichel> to DE
[14:35:46] <jymmmm> ah ok
[14:36:15] <Loetmichel> i wouldnt do that though
[14:36:41] <Loetmichel> car alternators are known to have a REALLY bad efficiency
[14:36:51] <jymmmm> why not (just curious, besides the driving for 6 hours)?
[14:37:00] <Loetmichel> they need about 10HP for every KW they have to put out
[14:37:15] <Loetmichel> you will burn loads of fuel just for the charging
[14:38:17] <jymmmm> Ah, yeah, car charging would be a nice option, but still not driving 6 hours.
[14:38:23] <rmu|w> Loetmichel: something is fishy with your calculation... 50W are 180kJ per hour. those 0,2 kg water need 67kJ to get from 20° to boiling.
[14:39:30] <jymmmm> rmu|w: So I get tea in 30 minutes instead? lol
[14:39:48] <rmu|w> yes...
[14:39:51] <rmu|w> 25min
[14:39:55] <jymmmm> woohoo!!!!
[14:40:10] <rmu|w> depending on ambient pressure and insulation ;)
[14:41:16] <jymmmm> rmu|w: I'm at 2500ft elevation, so a little better =)
[14:42:25] <rmu|w> not that much
[14:43:10] <rmu|w> boiling point will be lower, so cooking takes longer
[14:43:38] <jymmmm> If I have enough physical room, I should totally make a mini charger coffee pot for the hellva it. I think I'd have to jsut recirculate the water till it got up to temp (check valve), then a facuet to pour into cup
[14:44:31] <Loetmichel> rmu|w: yes, seems i did a divide to much
[14:44:35] <Loetmichel> good catch
[14:45:43] <rmu|w> Loetmichel: 2kW kettle takes less than 10 minutes for 2,5l, so.... 22h didn't feel right ;)
[14:46:20] <Loetmichel> asa i said: i HATE math
[14:46:54] <Loetmichel> but yeah, right
[14:46:57] <rmu|w> jymmmm: boiling point is 1K lower for every 1000ft (approx)
[14:47:22] <Loetmichel> dont forget though that you lose heat to ambient
[14:47:45] <Loetmichel> my cup warmers have 18W and BARELY can hold a cup of tea at 70°X
[14:47:49] <Loetmichel> 70°C
[14:48:37] <rmu|w> evaporating water takes away a LOT of heat
[14:48:52] <Loetmichel> http://www.cyrom.org
[14:49:03] <rmu|w> (i think 5 or 6 times the amount you need to get from 0 to 100)
[14:49:04] <Loetmichel> http://www.cyrom.org
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[14:50:20] <jymmmm> Loetmichel: Yeah, I have one of those too, while if feels hot to the touch, barely keeps the coffee warm at all
[14:50:24] <rmu|w> Loetmichel: get an insulated cup. stainless vacuum cup or something
[14:50:51] <jymmmm> rmu|w: vacuum cup won't work
[14:51:01] <Loetmichel> it MAY be perfect though: make an alu plate the size of a cup, mount the resistor to the bottom. should barely be enough to boil it once and then hold it at 80°
[14:51:14] <jymmmm> shoving the power resister IN the cup might though
[14:51:21] <Loetmichel> because the power dissipated will go down the fuller the batteries are
[14:51:23] <rmu|w> jymmmm: i mean to keep contents warm
[14:51:36] <jymmmm> rmu|w: me too =)
[14:51:47] <rmu|w> why wouldn't it work
[14:51:58] <CaptHindsight> well duh a vacuum cup is for holding a vacuum, not coffee
[14:52:17] <rmu|w> obviously
[14:52:41] <CaptHindsight> you would not put a vacuum in a coffee cup
[14:52:46] <jymmmm> rmu|w: imersion heater... https://www.amazon.com
[14:53:02] <Loetmichel> CaptHindsight: vaccuum cup?
[14:53:07] <rmu|w> https://www.amazon.com
[14:53:07] <jymmmm> CaptHindsight: french vacuum press?
[14:53:12] <Loetmichel> ah
[14:54:07] <jymmmm> I just meant a SS vacuum cup placed over a fire would never boil the water inside
[14:54:23] <Loetmichel> rmu|w: cant find one stainless cup with vacuum insualtion in my usual size
[14:54:34] <Loetmichel> also it needs to last a couple hours
[14:54:39] <jymmmm> Loetmichel: 44ounce big enough?
[14:54:44] <rmu|w> jymmmm: if you get the stainless steel red hot on the outside, the water will boil on the inside, trust me ;)
[14:54:45] <Loetmichel> i doubt taht'll work without external heat
[14:54:56] <Loetmichel> http://www.cyrom.org
[14:55:05] <Loetmichel> the cup on the left is a standard 0.2 liter cup
[14:55:08] <jymmmm> rmu|w: lol
[14:55:18] <rmu|w> Loetmichel: you would need one with a lid
[14:55:32] <CaptHindsight> water in a SS cup sealed would boil if you pulled a vacuum ...
[14:55:40] <Loetmichel> sounds like double the size i have now
[14:55:41] <CaptHindsight> you wouldn't even need a fire
[14:55:58] <Loetmichel> that "cup" isnt called a dewar flask by any chance?
[14:56:21] <jymmmm> Loetmichel: Here ya go, 64oz... https://www.walmart.com
[14:56:22] <rmu|w> CaptHindsight: if you did this in an insulated cup you would probably freeze the water befor it boils off
[14:56:41] <Loetmichel> jymmmm: CUP, not bottle!
[14:57:04] <Loetmichel> rmu|w: not only probably
[14:57:05] <jymmmm> Loetmichel: It IS my coffee "cup"
[14:57:16] <Loetmichel> it would freeze pretty fast
[14:57:17] <jymmmm> Loetmichel: ... well, the 44ox one
[14:57:25] <rmu|w> Loetmichel: dewar is usually made of glass and mirorr-coated on the inside
[14:57:30] <CaptHindsight> if I put a handle on a bottle, is it a cup?
[14:58:18] <jymmmm> Loetmichel: 7-11 sells coffee refills for $0.99 using a 44oz bottle
[14:58:37] <Loetmichel> the funny thing is: that black cup in the last picture was once part of a set with a matching 4 "cup" tea pot and 4 candle heater under it
[14:58:59] <Loetmichel> it holds 5/8L of beverage
[14:59:03] <Loetmichel> the CUP
[14:59:10] <jymmmm> Loetmichel: and when you buy 6 refills, you get the 7th one free
[14:59:29] <Loetmichel> was actually not that easy to lift the (ceramic) tea pot when full
[14:59:36] <rmu|w> Loetmichel: 5/8l ? are you sure it is not 5/8 cups or 5/8 oz or some other "imperial" unit?
[14:59:58] <CaptHindsight> jymmmm: does your 7-11 run out of coffee by 2-3pm?
[15:00:18] <Loetmichel> rmu|w_ 0.625l
[15:00:30] <Loetmichel> thats 5/8 in my book
[15:00:41] <jymmmm> CaptHindsight: I'd hit a couple of 7-11's across a 200 mile range each day, so nope =)
[15:00:44] <rmu|w> Loetmichel: ;)
[15:01:10] <Loetmichel> just because i am a german doesent mean i cant do fractions ;)
[15:02:00] <jymmmm> CaptHindsight: When I was fixing ATM's, I'd drive 5000 miles/month (company car), so drank a lot of coffee =)
[15:02:29] <rmu|w> Loetmichel: but i thought this "fraction-weakness" is the reason for "mass bier"? or was it the other way round? *musing*
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[15:05:06] <CaptHindsight> jymmmm: did any ATM's ever use BSD or Linux?
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[15:05:24] <jymmmm> CaptHindsight: They ALL used Windows7 sadly
[15:06:24] <CaptHindsight> jymmmm: all x86 as well?
[15:06:37] <jymmmm> CaptHindsight: If it says "DIEBOLD" on the ATM, it's Windows7 and X86
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[15:07:45] <Loetmichel> jymmmm: IIRC they used Win NT until recently
[15:08:25] <jymmmm> Loetmichel: 2018 all Win7 that I ever saw
[15:08:37] <CaptHindsight> jymmmm: met with Diebold in 1998, proposed a Linux voting machine with coreboot, never saw someone run so fast
[15:08:42] <Loetmichel> "recently" aka 2010 or so
[15:08:50] <Loetmichel> last time i saw one from the inside
[15:09:25] <jymmmm> CaptHindsight: Yeah, a pretty sad company now
[15:09:38] <jymmmm> Loetmichel: I doubt much has changed =)
[15:09:38] <rmu|w> those things used to run OS/2
[15:10:14] <jymmmm> The newest ATM's (black) are really plastic POS
[15:11:03] <jymmmm> The biggest issue is the cash dispensers in them
[15:11:29] <CaptHindsight> about 20 years ago there was a coreboot conference in Hamburg, just outside the hotel was a frozen ATM with the BIOS message, Error no keyboard, press F1 to continue
[15:11:37] <jymmmm> the plastic is so thin and cheap, that the unit jams when they fill them up
[15:11:55] <jymmmm> CaptHindsight: lol
[15:12:30] <jymmmm> CaptHindsight: The OS is hidden even from that unless I placed it into diag mode
[15:13:02] <CaptHindsight> rmu|w: https://www.coreboot.org
[15:13:11] <jymmmm> and I have to use a special dongle to even get into that
[15:14:27] <jymmmm> But if you ever want to kill a ATM machine hit the keypad hard in the corners of it. It'll go into security lockdown mode INSTANTLY =)
[15:14:55] <jymmmm> Not even I can get it out of that mode
[15:15:07] <jymmmm> could*
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[15:16:29] <CaptHindsight> rmu|w: sorry this one https://cdn.arstechnica.net
[15:16:30] <jymmmm> the keypad literally needs to get replaced, then go thru a shitton of security procudures and protocols on the phone, and entering in crypto challenge keys to activate it, such a PITA.
[15:19:26] <CaptHindsight> weren't the most successful attacks using card skimmers?
[15:21:51] <CaptHindsight> or the fake ATM
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[15:25:19] <perry_j1987> g'afternoon guys
[15:25:21] <perry_j1987> hows it going
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[15:57:10] <CaptHindsight> hhmm SpeedPAK from China shipped yesterday, will it really take 1 month to arrive?
[16:01:11] <XXCoder> speedpak is bit faster. more like 2 weeks?
[16:07:48] <CaptHindsight> used to be 1-2 weeks
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[16:08:12] <CaptHindsight> first order from China since the pandemic
[16:08:35] <XXCoder> its faster now. my recent orders arrived in a week or 2
[16:08:50] <XXCoder> during my plague time order one of em still havent arrived
[16:11:02] <XXCoder> lol. buy batteries "would you like to add protection plan?"
[16:15:53] <perry_j1987> i still havnt received any of the orders from china i put in a while ago
[16:15:57] <perry_j1987> they refunded all of it to me
[16:19:28] <XXCoder> yeah some of orders I had was refunded. one disappeared seemly for good, while 2 i evenually got 2 weeks after refunds
[16:22:00] <CaptHindsight> the lockdown in China was pretty complete in some areas
[16:22:18] <CaptHindsight> if you couldn't bank through your phone you were stuck
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[16:22:56] <perry_j1987> so i just got my first carbide insert threading tool
[16:23:07] <perry_j1987> tried setting it up in fusion 360 and running some gcode
[16:23:25] <perry_j1987> it seems to have made the threads wider than they should be
[16:23:39] <perry_j1987> thereby cutting off the peaks
[16:38:28] -!- perry_j1987 has quit [Quit: My MacBook has gone to sleep. ZZZzzz…]
[16:58:17] <Deejay> gn8
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[17:09:09] <perry_j1987> back
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[17:36:02] <perry_j1987> fusion 360 updated post processor for linuxcnc throwing error
[17:36:11] <perry_j1987> P portion missing with G76
[17:38:38] <Tom_itx> pitch
[17:38:54] <Tom_itx> distance per revolution
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[17:39:16] <Tom_itx> 20tpi = .050 iirc
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[17:44:14] <perry_j1987> wait nm
[17:44:25] <perry_j1987> i accidentaly used wrong postprocessor haha
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[17:50:12] <Hermitude> it happens perry
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[17:58:01] <perry_j1987> lol
[17:58:07] <perry_j1987> always happens to me lol
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